It will start until as it should go through 1st cycle and shut down. I have cleaned 3 times ,tested pof it worked as it should, snap disc ran it with it bypassed did the same , tested vacuum switch .
Golden eagle 5520
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After it shuts down check the control panel for a blinking heat level light
If heat level 2 is blinking then there is a vacuum error which means a bad fire door or ash pan seal or bad vacuum switch, bad or clogged vacuum hose or clogged spigot where vacuum hose connects to the stove.
If heat level 3 is blinking then there are no pellets in hopper, or a bad POF switch or bad High Limit snap disc or just a bad spade lug connection to all of these switches. So remove all female connectors one by one and push them back on to each switch to assure a good connection. If one is loose then squeeze with pliers to make the female give a snug connection.